Anyone else with me?

Yes

That’s actually quite common and in many ways is desirable. Memorization isn’t intelligence. You can remember facts and figures and the like, but being able to solve problems is a totally different skill than being able to memorize answers to problems. The difference comes when you encounter a problem you have never faced before. The difference between a degree and watching a YouTube video. You may be able to use a tutorial to solve your exact problem- but if you faced a similar problem and didn’t have a tutorial you wouldn’t have the skills to solve it. Memorizing things that are frequently used and convenient is good- but it’s better to memorize things that are harder to puzzle out or look up than things that don’t need memorized.

My brain goes “move one from the seven to the nine. 10+6 =16”

I take 9-1=8 and 7+1=8, so it's now even 8+8=16